Compass



Oct. 14, 1930. I I 5, 1 wU s 1,778,303

, commss '1 Original Filed Feb. 29, 1924 MM.- M m w WW2.

' Patented Oct. 14,1930:

. UNITED -size-res PATENT OFFICE" ERICK PAUL GUIDO WUNBCH, OF STEGLITZ; NEAR BERLIN, GERMANY, LSSIGNOB 1'0 AKTIENGESELLSCHAI'T VOBIALB CENTBALWIBKSTATT DEBBAU UND CARL BAMBEBG-FRIEDENAU, OI IBEBLIN-FBIEDBNAU, enmrm COMPAQ driginal application filed February 29, 1924, Serial No. 886,108, and in Germany Iarcli 14, 1923.

' Divided and. this application filed February a0, 1925. Serial 30. 10,719.

My application for Letters Patent Serial No. 696,103,'filed February29th, 1924, of which the present application is a divisional one, relates to a process and means for the frictionless transmission of movement from a moving primary element to a secondary element to be moved, which can be utilized in various branches of industry. According to the said invention a very slight movement is transmitted from a primary element, for instance such .as is usually automatically efl'ected onthe said element by an instru- ,ment, to a. secondary controlling or setting element or .to a servomotor, whereupon the said secondary element or servomotor effects the required operation.

. application of the devices claimed in the The present invention relates to a practical said'copcnding application and shows how the said processand means may be used in connection with a compass.

Compasses are known in which the movements of the needle are indicated at a distance and in which the movement of the compass needle is transmitted to the ship-steering or other means.

According to my invention this result is reached by new, more efiective means. I use a tube through which flows a pressure medium, the outflowingmedium controlling means for indicating or transmitting the movements of the compass needle to the re- .spective devices.

The tube is controlled by a separate magnetic system'which has a stationary axis and which magnetically coupled to the needle of a compass. The arrangement is thus considerably simplified and the pressure medium is entirely prevented from l1avi1ig any action upon the fluid compass. v

The device according to this invention is intended to indicate deviations from a set course or to control automatically the shipsteering means when such deviations occur. A constructional example of the device according to the present invention is diagrammati'tfiilly illustrated in the accompanying drawing in which Fig. lis a side view, partly in section, showing the device in combination pressure guage, while Fig. 2-illustrates a servo-motor controlled by the compass, said figure being a planview, partly in section.

Fig. 3 is an elevation of the device'shown in Fig. 2. I 4

In the casin 5 of the compass is mounted the card 56. 5n the bottom of the said casing is mounted in a bracket 57 a small device of magnetic material 58 which may be made of soft iron. ,The magnetic moment of the said device 58 is extremely small compared to that of the main magnet system or needle 65 of the fluid compass so that the two devices are magnetically coupled together,

and-the magnet device 58 follows exactly pipe 60 through which a liquid under pressure or a compressed gas, preferably com ressed air, is supplied. The pipe 59 could e provided with a balance weight 61 and has an outlet nozzle 62 which is situated 0pposite the open end of a pipe 63. The pipe 63 leads to that poii'ft at which the deviationof the ship from a set course is to be made visible and terminates there for instance is a pressure gauge 64.

The working of the device described is as follows 4 When the compass needle 65 swings relatively to the casing 55, the device 58 will execute an exactl identical oscillation about its own axis, in ependently of the position of the casing and independently of the action of the magnetism of the earth andwillturn the pipe 59 correspondingly. The compressed air escaping from the pipe 60 and passing through the pipe 59, passes into the pipe 63 and produces in the latter a given pressure which will beindicated by the pressure gauge 64. This pressure depends on I the jet of fluid escaping from the outlet of w ill) the relative positions of the pipe 63 and nozzle 62 and 1s a maximum when the vessel is on the desired course. en the needle swings to one'or to the other side, the nozzle 62 will also be moved to a greater or less extent away from the centre of the mouth of the pipe 63. The pressure in-the pipe 63 will therefore fall to a'greater or less extent, and the pressure gauge 64 will indicatea corresponding'movement. If it is desired to utilize the device for automatically executing a movement or a setting, for instance for automatic control of the steer ing of the vessel carrying the compass, the

nozzle 62" could be arranged, in accordance with Figure 2, opposite the mouth of two pipes f and g which are carried to the ends of a cylinder h. According as the needle 58 correspondin to the device 58 of Figure 1 swin to the right or to the left, the compresse air escaping from the nozzle 62 arnee e 58 and the balance weight 61 will pass to the one or to the other side of the cylinder, thereby producing a difference of ressure between t ton is connected in any desired manner to the shi -steering means and controls them in sue a manner that an automatic setting of said steerin means takes place when a deviation fromt e'set course occurs.

1- wish it to be understood that I have shown and described merely one example of the invention in connection with a certain stem of .a compass. However it will be evident to those skilled in the art that it may be used also in connection with other kinds 1 of such plants without departing from the spirit of-the invention.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is:

In a compass, particularly a fluid compass in combination a main magnet system, a

separate device of magnetic material having I a stationary axis coinciding with the axis of the main magnetic system, said device being ma etically influenced by the main system an turned by it about its axis, acompressedfluid tube connected with said separate device and controlled by it and having an outlet radial to the axis of the magnetic system and means to be operated in correspondence with the movement of the main magnet system and including means 'cooperatmg with sumo wunsoni ranged on the pipe 59 connected with the e two sides of the piston .2, so that the piston will be moved. The pis- 

